#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <arpa/inet.h>
#include <netdb.h>

#define PORT 3490
#define MAXDATASIZE 100

int main(int argc, char *argv[])
{
	int sockfd, numbytes;
	char rcv_buf[MAXDATASIZE];
	char snd_buf[MAXDATASIZE];
	struct hostent *he;
	struct sockaddr_in their_addr;

	struct sockaddr_in local_addr;
	int addrlen;

	if (argc != 2){
		fprintf(stderr,"usage: client hostname\n");
		exit(1);
	}
	
	if ((he=gethostbyname(argv[1])) == NULL){
		perror("gethostbyname");
		exit(1);
	}

	if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1){
		perror("socket");
		exit(1);
	}

	if(getsockname(sockfd,(struct sockaddr*) &local_addr, &addrlen) == -1){
		perror("getlocalname");
		exit(1);
	}

	their_addr.sin_family = AF_INET;
	their_addr.sin_port = htons(PORT);
	their_addr.sin_addr = *((struct in_addr *)he->h_addr);
	bzero(&(their_addr.sin_zero), sizeof(their_addr.sin_zero));

	if(connect(sockfd, (struct sockaddr *)&their_addr,sizeof(struct sockaddr)) == -1){
		perror("connect");
		exit(1);
	}

	numbytes = sprintf(snd_buf,"%s:%d\n", inet_ntoa(local_addr.sin_addr), ntohs(local_addr.sin_port));
	if(send(sockfd, snd_buf, numbytes, 0) == -1){
		perror("send");
		goto fail;
	}

	
	if ((numbytes=recv(sockfd, rcv_buf, MAXDATASIZE, 0)) == -1)	{
		perror("recv");
		exit(1);
	}

	rcv_buf[numbytes] = '\0';
	printf("Received: %s",rcv_buf);
fail:
	close(sockfd);
	return 0;
}
